I think "political" here referred to the fact that the way they set up the organisation allowed them to make political contributions, at a cost of having to pay $17m in tax more than they would've had to pay with a different setup.
Fill in the blanks:
"We need to fight climate change. I voted for ____."
"I don't think climate change is caused by humans. I voted for ____."
If you could perform the above task easily, then yes it's political.
Sure, but I think what OP was saying is that this says a lot about the US. For example in Germany, denying man made climate change is a fringe position. We just fight about how to stop it and at what cost.
You mean by shutting down nuclear plans and calling natural gas "green"?
With enough media firepower, anything can be made political, regardless of the underlying reality.
Everything that happens or is done in public is political, and the more it affects the public the more political it is. C̶l̶i̶m̶a̶t̶e̶ ̶c̶h̶a̶n̶g̶e̶ The climate emergency is a deeply political topic as it affects basically everyone.